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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Cash Flow Hedges |  |  |  |
Interest expense | $ 176,854 | $ 121,361 | $ 341,026 | $ 225,978
Trading |  |  |  |
Total | 15,102 | (5,852) | 16,675 | (6,278)
Designated as Hedging Instrument |  |  |  |
Fair Value Hedges |  |  |  |
Interest recognized on derivatives | (4,061) | (2,914) | (7,888) | 2,939
Hedged items recorded in interest expense | (57,717) | 7,451 | (81,703) | 22,717
Derivatives recorded in interest expense | 57,449 | (7,630) | 81,337 | (22,877)
Trading |  |  |  |
Total | (4,329) | (3,093) | (8,254) | 2,779
Designated as Hedging Instrument | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Cash Flow Hedges |  |  |  |
Interest expense | 1,189 | (579) | 2,485 | (2,122)
Trading |  |  |  |
Trading |  |  |  |
Change in fair value of future interest payments recorded in earnings | 18,242 | (2,180) | 22,444 | (6,935)
Total | $ 18,242 | $ (2,180) | $ 22,444 | $ (6,935)

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